﻿using System;
using System.Windows.Data;

namespace Mp3Observer.Common.Converter
{
    /// <summary>
    /// Converts a double value into the value*(-1)
    /// </summary>
    [ValueConversion(typeof(double), typeof(double))]
    public sealed class MalMinusEinsConverter : IValueConverter
    {
        #region IValueConverter Members

        /// <summary>
        /// Converts a double value into the value*(-1)
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            double result = 0;
            Double.TryParse(value.ToString(), out result);
            return result * -1;
        }

        /// <summary>
        /// not implemented.
        /// </summary>
        /// <param name="value">The value that is produced by the binding target.</param>
        /// <param name="targetType">The type to convert to.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <exception cref="NotImplementedException" />
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}
